package com.bai.boot;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication//MapperScan注解指定mapper接口的位置@MapperScan("com.bai.boot.mapper")public class ShoppingApplication {    public static void main(String[] args) {        SpringApplication.run(ShoppingApplication.class, args);    }}